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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '945aa1cb198438fb36c3ba2e8e04d335daebf986c5e963ad051a36ee2a5b0173' 
  AND token = 'P9s9HFAc2Ze8JSTLk67wV2JbDAkvGCAhda8fRJ3e95s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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