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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7e44cc4da40610be6ad89e1dba48a6afffad3e371589c46d5e735e7d99888eb' 
  AND token = 'qTOdtPqW2zSeLP/+xDQ8Z/0wXcxOqDFEuq2d8fYaNo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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