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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fac15ef2717abaa017aa8505026b7bcb027953ee2e2ba8c1bd9abed4f6fe8f54' 
  AND token = '+OZGy5//lkIyN4X6ggyehlQBIP2o9Ls1sjB4D+y+HwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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