SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '649ac920ef3e1446d901e775486b1c29d29cb31290952c423a7fb1db03cdf7d1' 
  AND token = '7vzgNFX5oyzOqk8Bv/vU4Lsjr7VHKPRSSwvlXcDmPC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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