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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a923871aee73693c63ae4d7442907fd1a6fc6692bd9eff435820450249ebf7b' 
  AND token = 'TrHQOIQRn1jwGdl1eFSKGszszTH8HL59uFiiFvudN+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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