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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c702a3dc7a455c269abc047334cb2a5d64bad208eb83ff82cefec625d2fbdfac' 
  AND token = '9Tz4PMa2u7FVmj9cBt9rb9vR9ZocGPA2PJGVDC7I3+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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