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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c701358fc6db07679dccee7e1ea2d51552a6b26815e9a3b4e6a1133c637c00f7' 
  AND token = 'c983JsMppgiRkxUGmBPHnzanmkMOShmqDWw1E0r5Rl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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