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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15e620ac1118d96cda4af6880f62028ededa6e8bf1428070325f582fd20ecb90' 
  AND token = 'Cb1byTAweM5QbdjxkM8Eq3A0om2/ggxVGLAP7284F3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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