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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e874696a44dfd3086e0911cfff0b86a41762e2eb127f57d59388bfe88591d000' 
  AND token = '1sTw1sln9zd1MTLFZjKGEOonE4oPe/FR/lYVrDH6O3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}