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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b07af1753440e1be721b9edcadcfddf375e7a602f9a31f2d7c9f09bcfbb994d4' 
  AND token = 'XAw7DbqJ31EKWWyDkwfWh4J+WXtOcUC2H0PwH5offEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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