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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffb3f387d9cbf91fe00248e91027b650d1afb30ddc33b85030aea8f2a843a9c7' 
  AND token = 'GLL5ou8qU3+4PFUDubUzhkIODlWEgPp/s1aM/btCbe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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