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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9407707ef5387487f8a2c5047f9b80ae332f359a172b7a881c529745750c3d7e' 
  AND token = 'wximJJRBlid4/s3Ech2z4SBqc2LvnB+dxX195dOvW1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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