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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9661e59466c8a1fa7ddf88df992af6584f584de4240a832a85ac6b96aee1f50c' 
  AND token = 'i+uqFTMHLsMS+n6qH4QV2ihdxdHLqKmGZWid6hrBHP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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