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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a934309665e4bf39bdced17466934264064806a65918499d2649f93bc1659c12' 
  AND token = 'ZCSioxtn9RO98CfOh5xJsEiNbA88ctwGX1fiBs8wbMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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