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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '303e37256832067d07190145e75a1640cc0a2deb32d3df61f340dcc3d0fd13fa' 
  AND token = 'nU4EPpcGXOZG5UHKgikJ18RnuKkSLcjSeqgA794/PdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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