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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e98e6ee25558f17abfd8000ea15d8332e282288d3d603b51f7d918d5eae1c444' 
  AND token = 'DuWmca/MUscjn6ZCXx10rVkzv/sWgiP6HPUraFtzWaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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