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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cd3ff27b0e8604f58175dbbcc0335cb5f9abdf83f1df0af6c713e1092453cb4' 
  AND token = 'Y7RtqDipc6MmfLwZdR2IV4oZpTv8Pub1B2iODMO3GwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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