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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6e8d8f9ecfa78baa23dc84be9ccffb594bd40bee80cf9b546c9d2cd4b773af5' 
  AND token = 'tOXcuINHYdw/Mkg4mH4qvtA8mFT02I8GfmHz5Haeomo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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