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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52dc299bea2e4c477ddb0f2de066ef5d746b038cfd0a24a72af3c3030258c9ae' 
  AND token = 'o1wp3JMNviFvRc15DY5NLePvl+8B9Ti7jNgoW7hs19Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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