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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c903a6d41d7411f91f5dcb924ae3dd32ad0466019593724604342503e86cb80d' 
  AND token = 'QqWM3bW58xfYLj/j+33LXLkp6Rvb6JkY+++g57Aebr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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