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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb7faa9a800b8d5e3e1e4d06473d8aa40a820019ccb73babdfc8b3fcd9fbef5a' 
  AND token = 'iJ4q8yZXSNavq2fj1cBin3waYvCAc13PDJATlk6gzHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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