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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcb0dc4148ca40155987a2d0b6d3575518e25e8eb5b40e503f5abd28321012c9' 
  AND token = 'XEw/ZBtyx91vfOdRdBScesVTmwkoNy+A8nRCnfTx5Xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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