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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f13b6d13bce06dc080d3c9115402f5e024f06a157b149fecbde6845191b1c2d' 
  AND token = '/MhJ8V3IjEY+xNvuaWKfrVvPzkNvCbfr4Mq0tG1up50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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