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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8655c7c5178c8fa9b48a7c830b661b3cfc959c8d4bd38f65da9f408c74342a4' 
  AND token = 'FGAu09Dh8f/5nP8DeeWY2+EnfZgG1guW2oasW/KlyiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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