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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d75d0019240f6541c716fcd80bbf47dec11ea6bf900b17fd371d49ad8cb29a0' 
  AND token = 'wiaWjmGsIV7B4nHv3s2WG1tEHo4503CeQK6kOiF45U0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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