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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24a9aef157dc80c5dcc46ce499918b94324db8ed589ea2a5cb84a56556e59a02' 
  AND token = 'Afeliwc/AgtfRGMy9K7XkXfU0m3amJTx723lBS/BZmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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