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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e633264be31718033aa26edf4bf2ca38a3c7cbd689bdd9f7b86a2ba9d1197b38' 
  AND token = '5kMk2TLr7SGLrB0ncQ47mTUxlzW2tFentzb4UPV7gag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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