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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11c72feeb05947ccfa19605bc09df0e70c7cde9b84ea552540285f9b1b51c128' 
  AND token = 'vdLXYnvBhz29VAJSyR2cfsM28VyhgRePFE6+w8315ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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