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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '692d8957caf976a7ea15ad2a124e102e397a2a15647427de2990f9e0cd5867ac' 
  AND token = 'WL1s2dgqKtev4PXzPG+gpnB02wwLY3raHKKvbSa4Q6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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