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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9b6b3f587968493307c4f70fae4247b2654930b7fcc4b2f05664546476d9524' 
  AND token = 'YuzXSWyb/Uc5dVMedbpjrBtB6b/tdLPGHIQYuUE/ON0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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