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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa20044393574e1dfd510af058f94ee50383b2855d4704fa100217d9a1df7a19' 
  AND token = 'lw77chCUgsRZ+gJFEZaYPUidSgBggiI2xdp+wLszgVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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