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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '153006b901b5fc64ae063cfd3b98812f219e0326826c9558c37937f0c2b729c8' 
  AND token = '5J5j82r2MKYTAqHR4pG3voL6PeLZwxiV/MCTKTo34C0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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