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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8d58843b55b814d580e54f265533ff773988c0167753040e72a1202f4768622' 
  AND token = 'FUJQMXf3d4eJQKxb+LaDmm7LgNvVPI7aAc8sMvHUBG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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