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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdc4b816e8e47688157c6ee708668a61b415f4323b917fa6eda18e8e16d1d823' 
  AND token = '7+/Et/uTcM65Br7zBMLY8b75Vf5mGytSFUEqXuJosz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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