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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6304a7e4ccd03bc00b23346d84438931e2888633c67351b9e2e594264a524bf' 
  AND token = 'NDA+KBSv/EA+jNBukLIg7D/yTvXOqsU6q3l83+Ft3mE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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