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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efd28c5f8c09fab32eeef09de6987f2d3da7e020cb9c4d7c24f03b11baa468ec' 
  AND token = 'IuwOhZOOG2u5zPMCpla0OvcXkDWjgMM5ayP+yLRfXvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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