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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '607d6696aff078fb3fac7577374b4fe6b7ea5abae2a9fb3139ab5976d6b71087' 
  AND token = 'M+mPlYeFiuv2uVLwtxaiFxPOblcn2MqCi3FDtVvPFCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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