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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4a8f532a000aca9cc3f7b4a95f5f53c5df14f9efcdaf90b4f7b7c18a6d5b661' 
  AND token = 'lTbapzPbXifF/y//SncUHe6Iwlu9CDdC8iTGwyeQ9f4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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