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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f9bd63bea3660d7173031220ce7a0083017b2a8ac66e3287dd94e3bb8271151' 
  AND token = 'T1lglQTa8VeIA8nMC3qRb4f5YF3ALp2J2Ha64f4sMgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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