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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b157d92cb2c2cfaecd4b2d1cd8e8dfd7ffea137d45d4aa7100b5f13296330fb9' 
  AND token = 'LRDJsf7aoti5vdoPrqf57n87P4tEepeCzyHHBaJL1uA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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