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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0790ca03df3fcfa7456ee1553f05c6d74f257620d59657350b8e057c5e3f659d' 
  AND token = '9vPTKh6VGg9yuLJsynXWwRfv/a4ULclwe68//mcDAXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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