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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffee8f2a19bc10a944d6525fc8ef9beb24bf3fee7fbacffc77268f2e98a959a0' 
  AND token = '1iNN622ozn53tcAVSuLkMt4jPeqTedMKLkmLLDHFz90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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