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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6094d1eedf780f17911fdfed3c319e9cbf8c4a576c28be834d619ce358ccfee0' 
  AND token = 'ru+fG8sXzIgUT6Hetu3CTmECZn4wnm4iOLN9fzf6zDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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