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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e6c648f91e2762d2f8f1e075f869fa9c681f19c28c11794b68184c4b93a13bd' 
  AND token = 'vBLRbR7G5XxxmdJKDpA6fdzslXs4M2Mt7hDh1AaeAfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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