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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba36f99ccb31316bd9b91d26741179a221755debc93f5e89021b49b279cef5c1' 
  AND token = 'MONfp1bON8jASMuCyOXP6Vx8O4lM/Y+hSGQ1HPsbq8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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