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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ac90b097b9d8bca34b8790c48f6db2a3ebd58b131520b0b71a48e8b38a8bd44' 
  AND token = 'NqIZF26jrS96/4aSNcpRVY1MrAtRo7l19VyDxKIr3QU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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