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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '084372ee1b0e78b2ac0b1ed3b150c2949385949c40e441d7ac17c024222b64b0' 
  AND token = '/glsn49TARCq5oNaJe1cK8yQa+CbcTDpfBvEUksl2yE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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