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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9022d087a4a0e96c6c4bc860e501987d22527e6e198c3cc271703d93e6099729' 
  AND token = 'zSbhnPkRjPFx91JP3zU1YKgj7EIv9SljHtoUgy75rrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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