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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '776cb349ae291c6083d72abd8aa6299559b18be07a6a2ac5eacc5c5660949fdc' 
  AND token = 'dq+jPF/q12Lm8/S6SqNbLDEz5qYgGBTJdZ8+i1kIaJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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