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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '412cd067ade5a9db8ca6df8fefb80598aa2fcfb63933d053efc9c3cd401ccc12' 
  AND token = '1dQVP4kR23m14M73DNwvHTNaDIfRcKtY3GaI+yGYxxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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