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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bcfdcb7d014fd0b203aada498151f3b94286d1109f789c92879b27330d77f87' 
  AND token = 'z2rmbgbz+/mVcrp/mdH166WP19KFsM5/B+Cn4GWDtTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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