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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'febbede05e53fb519f65aa45bdccbd0b37653c630a7127d4b13b4e085d0d44ae' 
  AND token = 'VsdQ5FDUDp+1959Qf67AltvTon2g/a036TYxqTMu2cU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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