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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca04ca1d78260fac370f5f8098c2f6e5d1d8519b07fc2bbcfc99f4316b5c75d9' 
  AND token = '7wCeBEI0EYUl/hZJgk19xw4YG9BNlcNCCrygZAMtk7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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