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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51042d6aabd53788b08e70e117b9ea55335f8676db8b063d3fa27930a16bbfe9' 
  AND token = 'I7I00Cp+kSxmGl/a+mDU91M4c7KYutjUOLXyrl1KeKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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