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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dd0d03b165dbc68dde3e0a1a3d3005440591077a69993454f7601884ecc9d87' 
  AND token = 'QdfSEvXt1ZTPMVMSLlKvfAbFXm9iWb1vB1xx8tfns2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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