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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc6f19a55c9eb8804e2cc0b32b1bbe81a23b3890db918fabe4061f96cf3ae919' 
  AND token = 'r9+hIP70cAlpPM7JoyvxgTp8isuVmUsOveAbG0pMmYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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