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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7895db563af92dd959c6338c4808a9f86953c0121a0a3b411e237a6d087984a3' 
  AND token = 'B9GtAovXTdb3A361950vKicAkXb0W8TlM5H2HxV+MzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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