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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60487d89a6b4b8a27aea911e4ad6a4add26492ae2d8dbe5ffcc4382b52ab2f5c' 
  AND token = 'yS0zRmPn18z2v9yKOH7y+nh2XCdVQ9Qam0rQ0W8hc90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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