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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a064a7da56d67d5208f35a2b58907593e5cf65efc333fac1b5ec32db77901603' 
  AND token = '51PyDsmnm7lh8X0BSZQzwrCqnu6L+MZA7fXF33uZeLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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