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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4fcf3900d26af37d9fd98e6c91d996fdb8317ccfb8f7e32c35bdb70d4a04473' 
  AND token = 'qc6r7LaHRQ2NrZk+moutGS0RMjcdrsk96kD4YCVY9Lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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