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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a56ed9f6c2ffbbe4c6b063fb959c2afb8fb89ec9218edf57c923b108f1a91f7a' 
  AND token = 'A9pV1ODCmZnQX12WVVQEn2J8S+1yWopx/j34CUk8AFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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