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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3197f1800f400832cd2d75b19b81c9b7d2df99db9fd2f26816cb5d297e47cdbf' 
  AND token = 'hBOgCGyLGdwqaHo/HlPztzUWaXR8b2kR24m6O3OIqMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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