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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfc459718ebb887e8d1d6253dd5a79ca4a7eaa9638bde2b067bd3281631d0745' 
  AND token = '+zOxdsfPHVjxYhdcB7laMbf82+CUm+hD0D3Dz8Ny43Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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