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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aff51d902783e4df9861877c2af4a206545987602b6218df26683ba78967fc41' 
  AND token = 'Y54POJXZulpNdtPSJNOoBcfa9AC0/UH4drmjkO5kExw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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