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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5eebcf23da25a4a68a73b285ea263c8f0c91300bc146a73b2b6031f17f1fcea' 
  AND token = '4hs6eMtyR54PLUyBJaJbAyCewPb8m6R5Ob5T1AdfbiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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